E bays are exceptionally cheap but check the shipping cost first!!

I have made several (Mike and I did), they will cut the lumber for you at some of the places you buy it and charge something like 10 cents a cut. You can carpet the whole thing or carpet some and sisal rope some, they LOVE sisal rope...

This is the one we made but before we attached the handicap ramp we made for Amy to get up there, the ramp is on the right, propped up.



Another we made for someone for Christmas


and another we made to donate to a church auction, a Noah's Ark